Found with PFGW Version 3.6.0

1700^3947-3947^1700 is 2-PRP! (6.0323s+0.0017s)
1700^3947-3947^1700 is 3-PRP! (6.0039s+0.0016s)
1700^3947-3947^1700 is 5-PRP! (5.9875s+0.0016s)
1700^3947-3947^1700 is 7-PRP! (5.9740s+0.0019s)
1700^3947-3947^1700 is 11-PRP! (5.9782s+0.0018s)

Primality testing 1700^3947-3947^1700 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 37
Running N+1 test using discriminant 47, base 1+sqrt(47)
Calling N-1 BLS with factored part 0.06% and helper 0.04% (0.24% proof)
1700^3947-3947^1700 is Fermat and Lucas PRP! (35.7130s+0.0017s)

To be completed...